"Surface tension" is a key phrase in the articleHow does the author refine the meaning of this phrase over the course of the article?(A) by providing real world examplos, citing specific statistics, and quoting expert opinions(8)by defining the torm, providing a list of materials, and contrasting two surface tension experiments(C) by defining the term, providing real world examples, and guiding the reader through ways to investigatesurface tension(D) by explaining the history of the term, defining the key components of an experiment, and thendescribing a surface tension experiment